From what I understand, they could possibly "freeze" up on you. LEDs do not draw as much current so the load equalizer tricks the computer into thinking that they are drawing the same as standard bulbs.

When I first installed my Aloy Art rear LED's and left the OEM fronts, they worked as they did from the factory. I think the front stock turn signals were acting as the LE. When I swapped bars and ditched the front signals all together, then they blinked fast and the key came on. I ran it that way for a full summer, 10+ thousand miles. Never had a problem. But then I saw how cheep the bad lands plug and play modual was and how it was literaly a plug in fix for my problem, so I got it and never turned back.